In the event of a primary failure, what will occur?

A Database Specialist is setting up a new Amazon Aurora DB cluster with one primary instance and three Aurora Replicas for a highly intensive, business-critical application. The Aurora DB cluster has one medium-sized primary instance, one large-sized replica, and two medium sized replicas. The Database Specialist did not assign a promotion tier to the replicas.

In the event of a primary failure, what will occur?
A . Aurora will promote an Aurora Replica that is of the same size as the primary instance
B . Aurora will promote an arbitrary Aurora Replica
C . Aurora will promote the largest-sized Aurora Replica
D . Aurora will not promote an Aurora Replica

Answer: A

Explanation:

Reference: https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/aurora-ug.pdf